php实现验证码的简单类

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/8/25 0025
 * Time: 18:16
 */

class Code{

    protected $number;
    protected $type;
    protected $width;
    protected $height;
    protected $code;
    protected $image;

    public function __construct($number = 4,$type = 3,$width= 200,$height = 60){
        $this->number = $number;
        $this->type = $type;
        $this->width = $width;
        $this->height = $height;
        $this->code = $this->createCode();
    }

    protected function createCode(){
        switch($this->type){
            case 1:
                $code = $this->createNumberCode();
                break;
            case 2:
                $code = $this->createStrCode();
                break;
            case 3:
                $code = $this->createStrNumberCode();
                break;
            default:
                break;
        }
        return $code;
    }

    protected  function createNumberCode(){
        $str = join('',range(0,9));
        return substr(str_shuffle($str),0,$this->number);
    }

    protected function createStrCode()
    {
        $str = join('', range('a', 'z'));
        $str = substr(str_shuffle($str.strtoupper($str)),0,$this->number);
        return $str;
    }

    protected function createStrNumberCode(){
        $number = join('',range(0,9));
        $str    = join('',range('a','z'));

        return substr(str_shuffle($number.$str.strtoupper($str)),0,$this->number);
    }

    public function __get($name){
        if($name == 'code'){
            return $this->code;
        }else{
            return false;
        }
    }

    public function outPutImage(){
        $this->createImage();

        //添加背景色
       $this->fillImage();

        // 将验证码填充进去
        $this->drawChar();

        header('Content-Type:image/png');

        imagepng($this->image);

        // 添加干扰元素
        //$this->drawalDisturbe();
        // 输出
       // $this->show();

    }

    protected function fillImage(){
        imagefill($this->image,0,0,$this->lightColor());

    }
    protected  function lightColor(){
        return imagecolorallocate($this->image,mt_rand(130,255),mt_rand(130,255),mt_rand(130,255));
    }
    protected  function darkColor(){
        return imagecolorallocate($this->image,mt_rand(0,120),mt_rand(0,120),mt_rand(0,120));
    }

    protected function drawChar(){
        $width = ceil($this->width/$this->number);
        for($i = 0;$i<$this->number;$i++){
            $x = mt_rand( $i* $width +5,($i+1)*$width -10);
            $y = mt_rand(0,$this->height - 15);
            imagechar($this->image,8,$x,$y,$this->code[$i],$this->darkColor());
        }

    }

    protected  function drawalDisturbe(){
        for($i = 0;$i<150;$i++){
            $x = mt_rand(0,$this->width);
            $y = mt_rand(0,$this->height);
            imagesetpixel($this->image,$x,$y,$this->lightColor());
        }
    }

    protected function show(){
        header('Content-Type:image/png');
        imagepng($this->image);
    }
    protected function createImage(){
        $this->image = imagecreatetruecolor($this->width,$this->height);
    }

   
}

 $Code  = new Code(4,3);
    $Code->outPutImage();